[Mesa-dev] [PATCH 1/3] vl/dri3: use external texture as back buffers(v4)

[Nayan Deshmukh]

On Sat, Jan 7, 2017 at 12:42 PM, Michel Dänzer <michel at daenzer.net> wrote:
> On 06/01/17 05:50 AM, Andy Furniss wrote:
>> Christian König wrote:
>>> Am 04.01.2017 um 18:13 schrieb Nayan Deshmukh:
>>>> dri3 allows us to send handle of a texture directly to X
>>>> so this patch allows a state tracker to directly send its
>>>> texture to X to be used as back buffer and avoids extra
>>>> copying
>>>>
>>>> v2: use clip width/height to display a portion of the surface
>>>> v3: remove redundant variables, fix wrapping, rename variables
>>>>      handle vaapi path
>>>> v3.1: we need clip_width/height for every frame so we don't need
>>>>        to maintain it for each buffer instead use a global variable
>>>> v4: In case of single gpu we can cache the buffers as applications
>>>>      use constant number of buffer and we can avoid calls to present
>>>>      extension for every frame
>>>>
>>>> Suggested-by: Leo Liu <leo.liu at amd.com>
>>>> Signed-off-by: Nayan Deshmukh <nayan26deshmukh at gmail.com>
>>>
>>> Acked-by: Christian König <christian.koenig at amd.com>.
>>>
>>> Andy & Leo did you guys already had a chance to test it? To me it looks
>>> like this should work now.
>>
>> Well there is still the tearing issue from loosing pageflips.
>>
>> Maybe different GPUs don't see this. I can fix by forcing perf but I
>> just tested dal and it's not even fixable running that.
>>
>> I guess that may not count as an issue with these patches as such if
>> xorg/xf86-video-amdgpu can work around, but it's a very noticeable
>> regression until that happens.
>
> Somebody should track down why the buffers sent for presentation in this
> case don't use the same tiling parameters as buffers used for GL via DRI3.
>
I can look into this, but I don't know where to look exactly. Can you give some
pointers to get started.

Regards,
Nayan
>
> --
> Earthling Michel Dänzer               |               http://www.amd.com
> Libre software enthusiast             |             Mesa and X developer